Gravity air cleaner for carburetors



Oct. 23, 1928. L689 l04 A. C. BENNETT GRAVITY AIR CLEANER FOR CARBUBETORS Filed May 18, 1925 In venzor: fis/zley Cf Bennett.

9 fif fornegs.

' Patented on. 23, 1928.

UNITED STATES PATENT OFFICE. f

ASHLEY C. BENNETT, OF MINNEAPOLIS MINNESOTA.

GRAVITY AIR 'CLEANER FOR CARBURETORS:

Application filed May 18, 1925. Serial No. 31,064.

My invention relates to gravity air clean ed to remove from the air going into the car- I" so buretor of a gas engine the particles of dust and dirt borne in or upon said air. To that end I provide the novel features of construction herein described and claimed.

The full objects and advantages of my invention are more fully described in the specification, and its novel features are particularly pointedout in the claims.

In the drawings illustrating one form of my invention,-

Fig. 1 is an elevation side view of my air cleaner as it will appear when connected with the intake of an internal. combustion or gas engine. Fig.2 is an edge view of the member-shown in Fig. 1. Fig. 3 is a sectional elevation on line 3-3 of'Fig. 2viewed in the direction of the arrows. Fig. 4 is a sectional elevation across the carburetor taken on the line 44 of Fig. 3 and viewed in the direction of the arrows. Fig. 5 is a sectional plan view taken on the line 5-5 of Fig. 3 viewed in the direction of the arrows.

My-carburetor attachment comprises a cylindrical casinglO provided with an upper opening 11 communicating with the upper portion of an inlet pipe 12. V The casing 10 is projected across a part of the opening 11 in a somewhat inwardly-turned lip 13. At the bottom the casing 10 is separated and the members lapped past one another forming a tangential opening as indicated at 14 in Fig. 3, this opening being across the cylindrical member 10 and formed between its outer wall and the inwardly-projected lip 15 extended from a portion of the cylindrical member 10.

To the cylindrical member 10 is secured at the center of its transvertical diameter an internally-threaded boss 16 which surrounds the opening 14; and into this boss is threaded the neck 17 of a receptacle 18 which may con- -veniently be a glass jar of the type used for ing 21 which is surrounded by an outwardly- IJI'OJBQtBd circumferential flange 23. To the flange member 23Fis secured by soldering or otherwise an elbow 24 of an outlet pipe 25 which is directly connected with the intake to the carburetor.

The front of the cleaner comprises an annular disc 26 having a flange 27 which embraces the cylindrical casing member 10 and 1s secured thereto by soldering, welding or in any desired way. The annular disc 26 is provided with a flange 28 surrounding its inner end and extending outwardly which is adapted to be engaged by a removable disc 29 having a flange 30 engaging over the flange 28 of the annular disc 26, said closure 29 being removably held in position by means of a thumb nut31 threaded upon the stemof a bolt 32 which bolt has its inner end secured by a screw 33 upon a spanner 34 extendmg across the opening 21 in the back member 19 and has its threaded end extending through a central opening in the front member 29.

These arts are so constructed that when the thum nut 31 is screwed upon the front member 29 an airtight connection is effected so that the air admission opening 11, the air outlet opening 21 and the dust receptacle opening'14 are the only openings into. the chamber formed by the cylindrical casing member 10 and the front and back members.

In this form of construction, when the motor is operating the suction induced by the dust that it carries is caused to whirl rapidly about the cylindrical casing member. This movement causes the particles of dust to be thrown by centrifugal force to the outside of the casing member, which-also is aided by. gravity in the lower portion thereof so that said particles of dust will move through the tangential opening 14 into the dead air space within the receptacle 18. where they will gravitate to the bottom and be permanently separated from the communicating air.

It may be desirable to provide in addition to the direct air-separating means above described a separate filter or strainer for removing the exceedingly minute and small quantity of dust particles not removed by the direct action of the cleaner, and such strainer thimble which is provided at its inner end with an annular flange seat 42 secured by solder or other means to the thimble member 4;. A circular screen 43 rests at the outer part of the flange member 42 and the annular space between the thimble 40 and the screen 43 is filled with mineral wool 44, or other suitable filtering substance. The front member 29 is provided with circular bead grooves 45 and 46 in which the thimble 40 and the screen member 42 respectivelv seat. A resilient annular gasket 47 is positioned between the bag member 19 and the thimble member 42, so that when the thumb nut 31 is screwed up, the strainer member is held rigidly fixed in position within the air cleaner, forming a cylindrical chamber 48- into which the air must pass through the filter member 44 before reaching the cleaner outlet or carburetor inlet 25.

Where the filter member is used the air will first pass into the annular space around if thefilter member is emploved. have to pass through it and in doing so the dust borne bv I said casing, an airtight receptacle secured to said casing below said dust-withdrawal opening, an air inlet pipe extending horizontally and tangentially from the upper portion of said casing, a hollow filtering member in said casing having its axis coinciding with the axis of the casing, and an air outlet pipe leading from the interior of said filtering memher.

2. An air cleaner for carburetors comprising a cylindrical casing having a removable end wall and adapted to be mounted with its axis horizontal, means forming a dust-withdrawal opening at the bottom of said casing, an airtight receptacle secured to said casing below said dust-withdrawal opening, an air inlet pipe extending horizontally and tangentially from the upper portion of said casing, a hollow filtering member removably held between the fixed wall and the removable wall of said casing and having its aXis coinciding with the axis of the casing, and an air outlet pipe leading from the interior of said filtering member.

In testimony whereof I hereunto afiix my signature.

ASHLEY C. BENNETT. 

